Barclay Bank (Uk) — want to know the truth of transaction

Address:

Dehradun, Uttarakhand

i have got the mail from barclay bank from U.k. that i have winning the prize of amount i.e. 550000 british pound. i contact with him and follow all instruction told by the agent of barclay bank from Uk who is came in Rbi office for the transaction of amount. i already deposite the 1 lakh rupees to the RBI for transfer of my winning amount in my account but now they want 2,95,800.00 rupees for tax clearence code. I want to know this transaction is true or falls. pls reply me immediately...